Apparatus for photographic enlargements by superposed impressions



R. DAUGE APPARATUS FOR PHOTOGRAPHIC ENLARGEMENTS BY SUPERPOSED IMPRESSIONS Filed May 8, 1928 5 Sheets-Sheet 1 Fig 1 Feb. 24, 1931.

R. DAUGE APPARATUS FOR PHOTOGRAPHIC ENLARGEMENTS BY SUPERPOSED IMFRESSIONS 3 Sheets-Sheet 2 Fiyled May 8. 1928 Feb. 24, 1931 R. DAUGE 1,794,279

APPARATUS FOR PHOTOGRAPHIC ENLARGEMENTS BY SUPERPOSED IMPRESSIONS Filed-May 8, 1928 3 Sheets-Sheet 3 p- Danae Patented Feb. 24, 1931 UNITED STATES ROBERT DAUGE, OF RUEIL, FRANCE APPARA'IUS FOR PHOTOGBAIPHIG ENLABGEMENTS BY SUPEBPOSED IMPRESSIONS Application filed Kay 8, 1928, Serial No. 276,142, and in France Kay 11, 1927.

The present invention relates'to an apparatus for photographic enlargements by superposed impressions, that is to say by projections, on one and the same surface to be' impressed, of several similar images differently placed on one and the samesensitized layer, so that the texture of the latter does not intervene for compromising the clearness of the images obtained with very great enlargements.

This apparatus is characterized by the combination of two surfaces one of which receives the plate which carries, in multiple impressions, the image to be enlarged, and the 5 other constitutes an obturator for successive- 1 covering and uncovering an optical proj ect1on and enlargement system, both surfaces being sub'ected to intermittent displacements com ined by a mechanism the actuation 'of which derives from afsingle shaft.

' The accompanying drawing illustrates, by

way of example only, two forms of construction of the apparatus above characterized. Figs. 1 to 3 relate to a first form of construction and are:

Fig. 1 a front view of the apparatus with parts broken away.

Fig 2 a cross section of the apparatus. Fig. 3 a horizontal section. Figs. 4 to 8 relate to a second form of construction and are:

Fig. 4 a partial cross section of the apparatus.

Fig.. 5 a partial front view. Fig. 6 a corresponding plan view. .Fig. 7 an elevation of a detail.

Fi 8 a corresponding plan view. I It 15 to be noted that the enlargement a paratus forming the subject-matter of e invention is also used as apparatus for. tak ng views for impressing on zones regularly. distributed about its center, one and the same plate which, from this fact, bears several times the same ima e, or for impressing 1ndependent plates. ach proof of the image is variously orientated relatively to the lines of distribution of the molecules or constituent elements of the sensitized layer, so that these images being projected very enlar v d and superposed on one and the same s we which can be impressed, the single proof obtained presents shades modeled without discontinuities, since the intermolecular spaces of a first projection are occupied by the molecular spots of the following images successively rojected.

In the orm of construction of Figs. 1 to 3, the apparatus comprises two discs arranged A in two parallel planes and of which, the obt-urator-disc 1 is arranged between the other,

. the late-carrying disc 2 and a source of light.

Bot discs 1 and 2 are projected on a plane which is parallel thereto, according to two circles which intersect each other, as shown in Fig.1. c

The'plate-carryin'g disc 2 is, in the example illustrated, constituted by a sheet-iron plate provided with largie'openings 3 in the shape of regularly distri uted sectors. Two slides 4, secured in position by welding or other suitable means, receive and hold the plate 5 on which are distributed the successive impressions 6 of the same image to be enlarged. In the example illustrated, the disc 2 presents eight openings 3 in the shape of sectors, and the plate 5 has eight images'6 regularl distributed about its center mingled wit the center of the disc 2. The images are placed opposite the apertured sectors 3. The obtu-' rator disc 1 is, for instance, cut out in a sheetiron plate and presents four apertures 7.

. 'The'circular trajectories of the images .6 and of the apertures 7 constantly intersect opposite an objective 8. .The frame of the apparatus comprises, inthe example illustrated, two parallelepi dic enclosures or chambers 9 and 10 ma e of sheet-iron and {)ieght-tight, at least concerning the chamr 9. Each disc is supported by an axis centered in a bearing 11 suitably secured to the wall 12. Counter shafts 13 and 14 are supported, parallel to the axes of the discs, by bearings 15 respectively secured on the walls 12 and 16; on these counter-shafts)? and 14 are rigidly secured Geneva wheels 17 the actuating arms of which are carried by plates 18 an 19 rigidly secnredon shafts 20 supported by bearings' 21and 22 (Fig. 3). A tangent wheel 23 rigidly secured on each of the shafts 100 ber 10, from any that the angular distances travelled over by the disc 1 for a quarter of a revolution of its driving Geneva wheel, are double those travelled over in the same conditions by the platecarrying disc 2. I

It is essential, in order that the projected images may be exactl super osed on the surface to be impresse that e stoppages of the disc 2 should take place in rigorously dete l-mined angular positions. For that purpose, the disc 2 can be'provided with periphages and admissible speeds of'rotation for the eral notches 28 in which enters a stop member 29 arranged at the end of a returning ring 30 secured to the c osure or casing 10. I

The operation of the apparatus thus described, either as apparatus for takin views, or as apparatus for the rojection 0 images for enlargement, is as fo lows Q,

In both cases, both discs 1 and 2 intermittently rotate. The disc 1 rotates for A of a revolution when'the disc 2 rotates for of a revolution.. Upon vstoppage, an image 6 is placed opposite the objective 8 and opposite an aperture .7 of the disc 1, so that eit er the lower part of the ena side opening 32 for the introduction of the The plate 34 on which are secured the im-- impression of the plate 5 for an image, or the projection of an 'image for enlargement can take place.

It is obvious that the obturator-disc 1 might be rovided witha sin le aperture 7 instead of our. In this case, t evalue of these intermittent angular displacements would ny be of 360 degrees. In the particular example described, the number 'ei ht for the number of the images and four gor the number of the orifices or apertures of theobturator-disc have been ado ted as satisfying discs. These numbers obviously are-notessential for the invention.

The apparatus can be mounted o able base or an port and provided a set of objectives a owing to utilize it indiflerently for taking images and for the enlargement ofthese images. The said base or support for the apparatus can be mounted on an adjustable tripod in the same way as for known photographic or kinematographic apparatus.

I e apparatus described in its essential lines, is corpleted by a movable door 31 adapted to ow of verifying the placing in plate 5 between the slides 4 of the platecarrying disc 2. The opening 32 must, of course, be provided with an obturator, of any suitable arrangement, light-tight, as well as the bearing edges of the'door 31. The source of light used for the projection can be constituted by any projection lantern independent of or integral with the frame of the ap- .paratus.

In the example of construction illustrated in Figs. 4 to 8, the surface bearing the images to be enlarged and the apertured opaque surface for constituting the obturator receive intermittent rectilinear displacements.

The obturator 33- is' suitably guided in slides and is movable in a horizontal plane.

ages to be enlarged ,is, in the same way, horizontally movable in slides. The objective is arran ed at 35 and the source of light is place at'36, the frame of the apparatus comprising the same general arrangements as for the example of construction of Figs. 1'

The intermittent rectilinearmovements of the parts 33 and 34 with suitable putting in phase of these movements, as ex lained in the preceding example, is obtaine from a single driving shaft, in the following manner: f The lower edge of the obturator 33' and that of the image-carrier 34 are cut as racks respectively gearing with pinions 37 and 38. Eachof these pinions is angularly rigid with a Geneva wheel 39 the actuation of which is efl'ectedbg a plate 41 provided with driving fingers. 0th plates 41 are fast on one and the same axis 42 which is caused to continuously rotate by the driving shaft 43, the angular connection betweenv the shaft 43 and the axis 42 being ensured, for instance, by means of a worm 44 and of a tangent wheel 45.

As in the example of Figs. 1 to 3, the obturator 33 can receive intermittent displacements which are double those imparted to the image-carrier. For that purpose, the plate with two driving fingers of the Geneva wheel 1 39, whilstthe other plate 41 has only one.

The principle of operation remains the same as for the apparatus of Figs. 1 to 3, the intermittent "angular" displacements being replaced by intermittent rectilinear displacesuitments.

In order that the stoppages of the obturator 33 and of the image-carrier 34 should take place at rigorously determined-points, the device diagrammaticallyillustrated in Figs. 7

land 8 can be adopted.

On their upper edge, the parts 33 and 34 are provided with notches 46 in each of which can successively enter aroller 47 loosely mounted on an axis 48 welded or secured inv any other manner, on a resilient support conname to this specification.

veniently constituted by a spring or curved blade 49 suitably secured at its ends on a fixed part of the frame of the apparatus.

It is to be understood that the invention is not limited to the examples particularly de scribed and illustrated. These examples are capable of receiving modifications in the constitution of their various parts as Well as in the relative arrangements of the latter.

All these modifications, provided they sat isfy to the essential feature set forth in the foregoing as Well as the object sought for, are included in the scope of the invention.

What 1 claim as my invention and desire to secure by Letters Patent is:

1. In an apparatus for taking multiple pictures of the same object upon a plate film and subsequently enlarging the said pictures by superposed impressions, an enclosure impervious to the light, a disc mounted upon a shaft for rotating in the said enclosure, means upon the said disc to support a plate or film, means for adapting, upon the enclosure, optical devices in the field of which the disc may bring successive zones of the plate or film, an obturator for covering and uncover.- ing the zone of the plate of film which are in the field of the optical devices, means for imparting to the disc intermittent angular displacements, and means to synchronize the said displacements with those of the obturator.

2. In an apparatus for taking multiple pictures of the same object upon a plate or film and subsequently enlarging the said pictures by superposed impressions, an enclosure impervious to the light, an apertured disc mounted upon a shaft to rotate in the said enclosure, means upon the said disc to support a plate or film, means for adapting, upon the enclosure, optical devices in the field of which the disc may bring successive zones of the plate or film, a revolving obturator the driving shaft of which is parallel to that of the disc, a pinion upon each of the said shafts, two Geneva Wheel mechanisms, means for angularly connecting the "said mechanisms with the said shafts, a single driving shaft rotated, in a continuous manner, and means for connecting the said driving shaft with the Geneva Wheel mechanisms.

In testimony whereof I have signed my- ROBERT DAUGE. 

